You've got the idea of "ultima" if you picked Answer B. Words with the same or rhyming ultimas can be important in a rhyming poem's lines, as any poet whose poems rhyme will tell you. The syllable just before the last syllable of a word can be just as important. That syllable is called the "penultima," or, more commonly, the "penult." Both "ultima" and "penult" come from Latin. "Ultima" means "last," and the "pen" of "penult" and "penultimate" comes from Latin "paene," meaning "almost."